Did you also test that incoming mail, or changes to SELECTed mailboxes is noticed while hibernated? Aki On 25/06/2026 18:34 EEST Jordan Ostrev via dovecot <[1]dovecot@dovecot.org> wrote: Hi Timo, I am running Dovecot 2.4.4 under FreeBSD 15.x, and I noticed that the IMAP hibernation feature fails to work natively on this platform. The Problem Under FreeBSD, running fstat() on a network socket returns NODEV (UINT64_MAX or 18446744073709551615) for both major()and minor() device numbers. When imap-hibernate tries to serialize these values, they are printed as 64-bit unsigned integers. However, Dovecot's internal parser in imap-master-client.c uses standard 32-bit integers (unsigned int) and str_to_uint(). This causes an integer overflow, triggering the following error during hibernation: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 The Solution I've created a patch for src/imap/imap-master-client.c that scales the parser variables to uint64_t and switches the parsing function to str_to_uint64(). Additionally, it updates the verification assertion to prevent BUG crashes due to the expected dev_tbehavior of virtual network sockets under FreeBSD. Here is the combined patch that fixes the issue completely: Fragment ot kod --- src/imap/imap-master-client.c.orig 2026-05-12 10:48:57 UTC +++ src/imap/imap-master-client.c @@ -75,7 +75,7 @@ imap_master_client_parse_input(const char *const *args const char **error_r) { const char *key, *value; - unsigned int peer_dev_major = 0, peer_dev_minor = 0; + uint64_t peer_dev_major = 0, peer_dev_minor = 0; i_zero(input_r); i_zero(stats_r); @@ -128,13 +128,13 @@ imap_master_client_parse_input(const char *const *args return -1; } } else if (strcmp(key, "peer_dev_major") == 0) { - if (str_to_uint(value, &peer_dev_major) < 0) { + if (str_to_uint64(value, &peer_dev_major) < 0) { *error_r = t_strdup_printf( "Invalid peer_dev_major value: %s", value); return -1; } } else if (strcmp(key, "peer_dev_minor") == 0) { - if (str_to_uint(value, &peer_dev_minor) < 0) { + if (str_to_uint64(value, &peer_dev_minor) < 0) { *error_r = t_strdup_printf( "Invalid peer_dev_minor value: %s", value); return -1; @@ -265,7 +265,7 @@ imap_master_client_parse_input(const char *const *args } if (peer_dev_major != 0 || peer_dev_minor != 0) { master_input_r->peer_dev = - makedev(peer_dev_major, peer_dev_minor); + makedev((unsigned long)peer_dev_major, (unsigned long)peer_dev_minor); } return 0; } @@ -410,7 +410,8 @@ static int imap_master_client_verify(const struct imap return -1; } if (peer_st.st_ino != master_input->peer_ino || - !CMP_DEV_T(peer_st.st_dev, master_input->peer_dev)) { + (!CMP_DEV_T(peer_st.st_dev, master_input->peer_dev) && + major(peer_st.st_dev) != (unsigned long)-1)) { *error_r = t_strdup_printf( "BUG: Expected peer device=%lu,%lu inode=%s doesn't match " "client fd's actual device=%lu,%lu inode=%s", Result With this patch applied, hibernation works flawlessly under FreeBSD: # doveadm who username # service (pids) (ips) [2]jordan@ostreff.info 1 imap (26000) (46.10.221.52) [3]jordan@ostreff.info 2 imap-hibernate (26260) (46.10.221.52) No error messages are logged by dovecot when it hibernates and restores clients. I hope this can be integrated into the upstream code. Best regards, Jordan On 25 Jun 2026, at 15:50, Jordan Ostrev <[4]jordan@ostreff.info> wrote: Hi Timo, i'm not programmer at all but here is my understanding of the problem: In src/imap/imap-client-hibernate.c, the code serializes peer_dev_major and peer_dev_minor using major() and minor() macros: str_printfa(cmd, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu\tpeer_ino=%llu", (unsigned long)major(peer_st.st_dev), (unsigned long)minor(peer_st.st_dev), (unsigned long long)peer_st.st_ino); On FreeBSD, major() and minor() can return UINT64_MAX (18446744073709551615) for file descriptors that are not block/character devices (such as sockets on tmpfs/devfs). This value exceeds UINT_MAX and cannot be parsed by str_to_uint() in imap-master-client.c, causing hibernation to fail. On 25 Jun 2026, at 14:37, Jordan Ostrev <[5]jordan@ostreff.info> wrote: Hi Timo, I've made freebsd port patch which looks like that: # cat files/patch-configure.ac --- configure.ac.orig 2026-06-25 11:03:42 UTC +++ configure.ac @@ -363,7 +363,7 @@ AS_CASE( DOVECOT_IOLOOP DOVECOT_NOTIFY AS_CASE( - ["$notify"], + ["$have_notify"], [none], [BUILD_IMAP_HIBERNATE=0], [kqueue], [BUILD_IMAP_HIBERNATE=0], [BUILD_IMAP_HIBERNATE=1]) I'm simulating the situation with telnet: c idle + idling * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here * OK Still here * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here d idle c BAD Idle completed. + idling * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * 4228 EXISTS * 4227 FETCH (FLAGS (\Seen $NotJunk NotJunk)) * 4228 EXPUNGE * OK Still here in the log I see following: Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap([6]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap([7]jordan@ostreff.info)<30943><EJZELRJVp5QuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap([8]jordan@ostreff.info)<30943><EJZELRJVp5QuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap([9]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:29:28 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:29:28 classic dovecot[29292]: imap([10]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:36 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:36 classic dovecot[29292]: imap([11]jordan@ostreff.info)<33114><cX5QWRJVrZguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:37 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:37 classic dovecot[29292]: imap([12]jordan@ostreff.info)<33112><NlVOWRJVkbEuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:34:40 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:34:40 classic dovecot[29292]: imap([13]jordan@ostreff.info)<33112><NlVOWRJVkbEuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Here is my piece of my config: # dovecot -a | grep hibernate imap_hibernate_timeout = 1 mins service imap-hibernate { unix_listener imap-hibernate { What we can do more? KR, Jordan On 25 Jun 2026, at 12:34, Timo Sirainen <[14]timo@sirainen.com> wrote: On 24. Jun 2026, at 21.34, Jordan Ostrev via dovecot <[15]dovecot@dovecot.org> wrote: Hi, IMAP hibernation compiles and attempts to run on FreeBSD 15.x (tested with Dovecot 2.4.4 and FreeBSD 15.1), but fails at runtime with: plain imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap([16]jordan@ostreff.info)<37120><ExaV/gNVAdt/AAAB>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 .. 1. Disable hibernation at compile time for kqueue systems, or It was already supposed to be done, but looks like there's a bug. Can you verify if this works? : diff --git a/configure.ac b/configure.ac index 9beacaa299..04f9c8edd6 100644 --- a/configure.ac +++ b/configure.ac @@ -363,7 +363,7 @@ DOVECOT_TYPEOF DOVECOT_IOLOOP DOVECOT_NOTIFY AS_CASE( - ["$notify"], + ["$have_notify"], [none], [BUILD_IMAP_HIBERNATE=0], [kqueue], [BUILD_IMAP_HIBERNATE=0], [BUILD_IMAP_HIBERNATE=1]) Hi Timo, I am running Dovecot 2.4.4 under FreeBSD 15.x, and I noticed that the IMAP hibernation feature fails to work natively on this platform. The Problem Under FreeBSD, running fstat() on a network socket returns NODEV (UINT64_MAX or 18446744073709551615) for both major()and minor() device numbers. When imap-hibernate tries to serialize these values, they are printed as 64-bit unsigned integers. However, Dovecot's internal parser in imap-master-client.c uses standard 32-bit integers (unsigned int) and str_to_uint(). This causes an integer overflow, triggering the following error during hibernation: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 The Solution I've created a patch for src/imap/imap-master-client.c that scales the parser variables to uint64_t and switches the parsing function to str_to_uint64(). Additionally, it updates the verification assertion to prevent BUG crashes due to the expected dev_tbehavior of virtual network sockets under FreeBSD. Here is the combined patch that fixes the issue completely: Fragment ot kod --- src/imap/imap-master-client.c.orig 2026-05-12 10:48:57 UTC +++ src/imap/imap-master-client.c @@ -75,7 +75,7 @@ imap_master_client_parse_input(const char *const *args const char **error_r) { const char *key, *value; - unsigned int peer_dev_major = 0, peer_dev_minor = 0; + uint64_t peer_dev_major = 0, peer_dev_minor = 0; i_zero(input_r); i_zero(stats_r); @@ -128,13 +128,13 @@ imap_master_client_parse_input(const char *const *args return -1; } } else if (strcmp(key, "peer_dev_major") == 0) { - if (str_to_uint(value, &peer_dev_major) < 0) { + if (str_to_uint64(value, &peer_dev_major) < 0) { *error_r = t_strdup_printf( "Invalid peer_dev_major value: %s", value); return -1; } } else if (strcmp(key, "peer_dev_minor") == 0) { - if (str_to_uint(value, &peer_dev_minor) < 0) { + if (str_to_uint64(value, &peer_dev_minor) < 0) { *error_r = t_strdup_printf( "Invalid peer_dev_minor value: %s", value); return -1; @@ -265,7 +265,7 @@ imap_master_client_parse_input(const char *const *args } if (peer_dev_major != 0 || peer_dev_minor != 0) { master_input_r->peer_dev = - makedev(peer_dev_major, peer_dev_minor); + makedev((unsigned long)peer_dev_major, (unsigned long)peer_dev_minor); } return 0; } @@ -410,7 +410,8 @@ static int imap_master_client_verify(const struct imap return -1; } if (peer_st.st_ino != master_input->peer_ino || - !CMP_DEV_T(peer_st.st_dev, master_input->peer_dev)) { + (!CMP_DEV_T(peer_st.st_dev, master_input->peer_dev) && + major(peer_st.st_dev) != (unsigned long)-1)) { *error_r = t_strdup_printf( "BUG: Expected peer device=%lu,%lu inode=%s doesn't match " "client fd's actual device=%lu,%lu inode=%s", Result With this patch applied, hibernation works flawlessly under FreeBSD: # doveadm who username # service (pids) (ips) [17]jordan@ostreff.info 1 imap (26000) (46.10.221.52) [18]jordan@ostreff.info 2 imap-hibernate (26260) (46.10.221.52) No error messages are logged by dovecot when it hibernates and restores clients. I hope this can be integrated into the upstream code. Best regards, Jordan On 25 Jun 2026, at 15:50, Jordan Ostrev <[19]jordan@ostreff.info> wrote: Hi Timo, i'm not programmer at all but here is my understanding of the problem: In src/imap/imap-client-hibernate.c, the code serializes peer_dev_major and peer_dev_minor using major() and minor() macros: str_printfa(cmd, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu\tpeer_ino=%llu", (unsigned long)major(peer_st.st_dev), (unsigned long)minor(peer_st.st_dev), (unsigned long long)peer_st.st_ino); On FreeBSD, major() and minor() can return UINT64_MAX (18446744073709551615) for file descriptors that are not block/character devices (such as sockets on tmpfs/devfs). This value exceeds UINT_MAX and cannot be parsed by str_to_uint() in imap-master-client.c, causing hibernation to fail. On 25 Jun 2026, at 14:37, Jordan Ostrev <[20]jordan@ostreff.info> wrote: Hi Timo, I've made freebsd port patch which looks like that: # cat files/patch-configure.ac --- configure.ac.orig 2026-06-25 11:03:42 UTC +++ configure.ac @@ -363,7 +363,7 @@ AS_CASE( DOVECOT_IOLOOP DOVECOT_NOTIFY AS_CASE( - ["$notify"], + ["$have_notify"], [none], [BUILD_IMAP_HIBERNATE=0], [kqueue], [BUILD_IMAP_HIBERNATE=0], [BUILD_IMAP_HIBERNATE=1]) I'm simulating the situation with telnet: c idle + idling * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here * OK Still here * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * OK Still here d idle c BAD Idle completed. + idling * OK Still here * 4228 EXISTS * 1 RECENT * 4228 EXPUNGE * 0 RECENT * OK Still here * 4228 EXISTS * 4227 FETCH (FLAGS (\Seen $NotJunk NotJunk)) * 4228 EXPUNGE * OK Still here in the log I see following: Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap([21]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:21:17 classic dovecot[29292]: imap([22]jordan@ostreff.info)<30943><EJZELRJVp5QuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap([23]jordan@ostreff.info)<30943><EJZELRJVp5QuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:26:03 classic dovecot[29292]: imap([24]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:29:28 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:29:28 classic dovecot[29292]: imap([25]jordan@ostreff.info)<29454><CLP/EhJVqIguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:36 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:36 classic dovecot[29292]: imap([26]jordan@ostreff.info)<33114><cX5QWRJVrZguCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:37 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:33:37 classic dovecot[29292]: imap([27]jordan@ostreff.info)<33112><NlVOWRJVkbEuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:34:40 classic dovecot[29292]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 25 14:34:40 classic dovecot[29292]: imap([28]jordan@ostreff.info)<33112><NlVOWRJVkbEuCt00>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Here is my piece of my config: # dovecot -a | grep hibernate imap_hibernate_timeout = 1 mins service imap-hibernate { unix_listener imap-hibernate { What we can do more? KR, Jordan On 25 Jun 2026, at 12:34, Timo Sirainen <[29]timo@sirainen.com> wrote: On 24. Jun 2026, at 21.34, Jordan Ostrev via dovecot <[30]dovecot@dovecot.org> wrote: Hi, IMAP hibernation compiles and attempts to run on FreeBSD 15.x (tested with Dovecot 2.4.4 and FreeBSD 15.1), but fails at runtime with: plain imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap-hibernate: Error: conn unix:imap-hibernate (uid=125): Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 Jun 24 21:27:08 classic dovecot[36888]: imap([31]jordan@ostreff.info)<37120><ExaV/gNVAdt/AAAB>: Error: Couldn't hibernate imap client: /var/run/dovecot/imap-hibernate returned failure: Failed to parse client input: Invalid peer_dev_major value: 18446744073709551615 .. 1. Disable hibernation at compile time for kqueue systems, or It was already supposed to be done, but looks like there's a bug. Can you verify if this works? : diff --git a/configure.ac b/configure.ac index 9beacaa299..04f9c8edd6 100644 --- a/configure.ac +++ b/configure.ac @@ -363,7 +363,7 @@ DOVECOT_TYPEOF DOVECOT_IOLOOP DOVECOT_NOTIFY AS_CASE( - ["$notify"], + ["$have_notify"], [none], [BUILD_IMAP_HIBERNATE=0], [kqueue], [BUILD_IMAP_HIBERNATE=0], [BUILD_IMAP_HIBERNATE=1]) _______________________________________________ dovecot mailing list -- [32]dovecot@dovecot.org To unsubscribe send an email to [33]dovecot-leave@dovecot.org References Visible links 1. mailto:dovecot@dovecot.org 2. mailto:jordan@ostreff.info 3. mailto:jordan@ostreff.info 4. mailto:jordan@ostreff.info 5. mailto:jordan@ostreff.info 6. mailto:jordan@ostreff.info 7. mailto:jordan@ostreff.info 8. mailto:jordan@ostreff.info 9. mailto:jordan@ostreff.info 10. mailto:jordan@ostreff.info 11. mailto:jordan@ostreff.info 12. mailto:jordan@ostreff.info 13. mailto:jordan@ostreff.info 14. mailto:timo@sirainen.com 15. mailto:dovecot@dovecot.org 16. mailto:jordan@ostreff.info 17. mailto:jordan@ostreff.info 18. mailto:jordan@ostreff.info 19. mailto:jordan@ostreff.info 20. mailto:jordan@ostreff.info 21. mailto:jordan@ostreff.info 22. mailto:jordan@ostreff.info 23. mailto:jordan@ostreff.info 24. mailto:jordan@ostreff.info 25. mailto:jordan@ostreff.info 26. mailto:jordan@ostreff.info 27. mailto:jordan@ostreff.info 28. mailto:jordan@ostreff.info 29. mailto:timo@sirainen.com 30. mailto:dovecot@dovecot.org 31. mailto:jordan@ostreff.info 32. mailto:dovecot@dovecot.org 33. mailto:dovecot-leave@dovecot.org